Mob City is a 2013 crime series created by Frank Darabont and focuses on the conflict between the mob and the LAPD that started in the late 1940s. The series was based on the novel L.A. Noir: The Struggle for the Soul of America's Most Seductive City by John Buntin and premiered in the US on the TNT network on December 4, 2013.

Handguns

Colt Detective Special

What appears to be snub nose Colt Detective Special revolvers are used by mobsters and LAPD officers in the series.

Colt Detective Special 1st Gen with Square Butt - .38 Special

Joe (Jon Bernthal) uses the snub revolver near the end of "A Guy Walks Into a Bar" (S1E01).

Joe holds the revolver near the end of "A Guy Walks Into a Bar" (S1E01).

Sid Rothman (Robert Knepper) dual-wields the revolvers near the end of "Reason to Kill a Man" (S1E02).

Sid fires a couple of Colt Detective Special revolvers to execute two mobsters near the end of "Reason to Kill a Man" (S1E02). Note that the ejector rod is longer than the typical Colt Detective Special.

On the left, a gangster opens fire with the revolver in "Red Light" (S1E03).

Terry Mandel (Richard Brake) uses the Mauser in "Oxpecker" (S1E05). A close examination shows the magazine release button and the magazine well is more square then round - which denotes the selective fire version.

Shotguns

12 Gauge Double Barreled Shotgun

A Short barreled Side by Side Shotgun is used by Sid Rothman (Robert Knepper) to blast a ratting mobster in "A Guy Walks Into a Bar" (S1E01). Sid later holds a freshly sawed-off shotgun in "His Banana Majesty" (S1E04). Another is used by a mob assassin near the end of "Oxpecker" (S1E05).

Stevens 311R (sawed-off) - 12 gauge.

This is the screen used Zabala short barreled shotgun used by Denzel Washington in the film Man on Fire, very similar to Tony's lupara on The Sopranos.

The sawed-off shotgun before being fired in the confessional booth in "A Guy Walks Into a Bar" (S1E01).

Sid holds the double barreled shotguns before the barrels are cut off in "His Banana Majesty" (S1E04).

In 1927, an LAPD officer holds the Thompson with a Cutts compensator at the start of "Reason to Kill a Man". (S1E02)

Siegel's men open fire with Thompsons in "His Banana Majesty" (S1E04). These appear to be fitted with 100 round magazines.

Rifles

M1 Carbine

Joe Teague keeps an M1 Carbine in the trunk of his police car. He first is seen taking it out in "A Guy Walks Into a Bar" (S1E01). Note that this is a period correct M1, lacking the bayonet lug (which was not added until the Korean War).

World War II Era M1 Carbine, with Dark Walnut Stock, 'L' peep sight and no bayonet lug - correct for most of WWII, shown with khaki sling and Magazine pouch for buttstock - .30 Carbine

Joe aims the M1 Carbine at mobsters during an item exchange. (S1E01)

Joe uses his M1 Carbine during the carousel shootout in "Red Light" (S1E03).